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Raindrops::TCP_Info

This is used to wrap "struct tcp_info" as described in tcp(7) and /usr/include/linux/tcp.h. The following readers methods are defined corresponding to the "tcpi_" fields in the tcp_info struct.

In particular, the last_data_recv field is useful for measuring the amount of time a client spent in the listen queue before +accept()+, but only if TCP_DEFER_ACCEPT is used with the listen socket (it is on by default in Unicorn).

kernel.org/doc/man-pages/online/pages/man7/tcp.7.html

Public Class Methods

Raindrops::TCP_Info.new(tcp_socket) → TCP_Info object click to toggle source

Reads a TCP_Info object from any given tcp_socket. See the tcp(7) manpage and /usr/include/linux/tcp.h for more details.

static VALUE init(VALUE self, VALUE io)
{
        int fd = my_fileno(io);
        struct tcp_info *info = DATA_PTR(self);
        socklen_t len = (socklen_t)sizeof(struct tcp_info);
        int rc = getsockopt(fd, IPPROTO_TCP, TCP_INFO, info, &len);

        if (rc != 0)
                rb_sys_fail("getsockopt");

        return self;
}

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